The kind of catapult we're working on is called a trebuchet. It uses gravity to launch the tennis ball. We're redesigning a trebuchet that I had made last year with some middle schoolers.

These old catapults had a pouch on one end of a long wooden beam, with a large heavy weight at the other end. When the weight was released, gravity pulled it down, and the pouch on the other end ...

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The Satellite Applications Catapult has upgraded its In-Orbit Servicing, Assembly and Manufacturing (ISAM) facility to add a gravity offload system. The large steel structure – to simulate ...

From using the kinetic energy stored in twisted ropes and sinews to launch projectiles, catapults were developed using hydraulics, gravity and air as propellants. Steam became a favourite with ...